Shutting Down - Agilent Technologies VGA 77 User Manual

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Shutting Down

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Inert gas will flow through the separator even with the VGA 77 switched off.
NOTE
Agilent Vapor Generation Accessory VGA 77 and VGA 77P User's Guide
Load the autosampler with your analytical blank, standard
solutions and samples in the correct locations.
Save your revised method.
Before starting the analytical program, carefully check all
sampling parameters to ensure that they are correct. Also check
that the reagent containers are full.
Turn off the flame/torch as described in your instrument
operation manual. Leave the VGA 77 switched on. You will also
need to leave the ICP pump running.
Run a concentrated hydrochloric acid solution through the
system for 2 to 5 minutes then immerse the three uptake
capillary tubes in a container of distilled water (at least 200 mL)
and leave the pump running for 10 to 20 minutes to flush the
system.
Remove the capillary tubes from the distilled water. Leave the
pump running until the distilled water has been pumped through
the system.
Switch the VGA 77 off, but leave the inert gas supply on at the
regulator. Open the pressure bar and swing the pump tube beds
clear of the pump rollers. Remove the pump tubes from the pump
rollers and release them from the retaining bracket. Ensure that
they are kept completely clear of the rollers while you carry out
the next step.
Switch the VGA 77 on. This will allow inert gas to flow through
the entire system and thus minimize the possibility of residual
solutions settling in the lowest section of the tubing. Allow the
inert gas to flow for about five minutes.
Switch off the VGA 77, and the ICP pump, if necessary.
Turn off the inert gas supply at the regulator.
Operation
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